Bi.sub.2 [M.sub.2-x Bi.sub.x ]O.sub.7-y compounds wherein M is Ru, Ir or mixtures thereof, and electrochemical devices containing same (Bat-24)
AssigneeExxon Research & Engineering Co.
InventorsHarold S. Horowitz, John M. Longo, Joseph T. Lewandowski
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Abstract
Novel bismuth-rich pyrochlore-type compounds are described having the formula: Bi.sub.2 [M.sub.2-x Bi.sub.x ]O.sub.7-y wherein M is selected from the group consisting of Ru, Ir and mixtures thereof and wherein x is greater than zero and less than or equal to about 1.0 and y is greater than or equal to zero and less than or equal to about 1.0. Electrochemical devices containing these compounds as electrocatalyst materials for oxygen electrodes are also described.
Claims34
A compound having the formula:
- Bi.sub.2 [M.sub.2-x Bi.sub.x ]O.sub.7-y
- wherein M is selected from the group consisting of Ru, Ir and mixtures thereof, wherein x is greater than or equal to about 0.1 and less than or equal to about 1.0 and wherein y is greater than or equal to zero and less than or equal to about 1.0.
In an electrochemical device having an oxygen electrode containing an electrocatalyst material, the improvement comprising using as said electrocatalyst material one or more compounds selected from the group consisting of those compounds having the following formula:
- Bi.sub.2 [M.sub.2-x Bi.sub.x ]O.sub.7-y
- wherein M is selected from the group consisting of Ru, Ir and mixtures thereof, wherein x is greater than or equal to about 0.1 and less than or equal to about 1.0, and wherein y is greater than or equal to zero and less than or equal to about 1.0.
Dependencies are inferred from the claim text.